"I've been doing a good spot of research on this--have wondered about it for awhile. There is a story that both Tolkien and CS Lewis were briefly members of the Order of the Golden Dawn, but were kicked out for being inept. "
Don't keep us in suspense -

- where does this information come from?
As for the Priory of Sion - there was a TV programme on Channel 4 a few years ago, when the movie of Dan Brown's first book came out (blessed if I can remember the name now). The whole Priory of Sion thing was shown to be a hoax, perpetrated by some guys in France. It's all rubbish, really.